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🔬 Resolution Inspector

Check Image DPI Online

Upload any image and instantly see its DPI, PPI, and resolution. Find out the exact print size in inches and centimetres. Free, instant, no upload.

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How to check image DPI online

  1. Open the Image DPI Checker
  2. Upload your JPEG, PNG, TIFF, or other image file
  3. The tool reads embedded resolution data from the file's binary headers
  4. Your DPI, pixel dimensions, print size and quality rating appear instantly
  5. Use the custom DPI field to simulate a different print resolution

Why the DPI value matters

DPI determines how large your image will print at a given quality. An image that is 3000×2000 pixels printed at 300 DPI produces a 10″×6.67″ print. The same image at 72 DPI would produce a 41.7″×27.8″ print — but at very low quality. Checking DPI before printing prevents blurry, pixelated results.

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Frequently Asked Questions

DPI (dots per inch) measures how many ink dots a printer places per inch. Higher DPI means sharper printed output. 72 DPI is screen resolution; 150 DPI is acceptable for large prints; 300 DPI is the standard for professional print quality.
For a sharp A4 print (210×297mm / 8.27×11.7 inches) at 300 DPI, your image must be at least 2480×3508 pixels. At 150 DPI, 1240×1754 pixels is the minimum for acceptable quality.
Not necessarily. DPI metadata stored in the file is just a tag — it does not change the actual pixel count. A 6000×4000 pixel image tagged at 72 DPI still prints sharp if it has enough pixels for the print size.
PPI (pixels per inch) refers to digital screen density. DPI (dots per inch) refers to printer output density. They are often used interchangeably but are technically distinct. For most purposes, the distinction does not affect how you should resize or prepare images.
You can change the DPI metadata tag without resampling pixels — this changes the number stored but not the image data. However, to actually increase printed sharpness you need to upscale the pixel dimensions, which is different from changing the DPI tag alone.
Photo books typically require 200–300 DPI at the print size. Check your photo book provider's requirements. Most require 300 DPI for sharp results on glossy paper.

DPI requirements for common print formats

Print FormatMin DPIMin Pixels (W×H)
4×6 inch photo300 DPI1200×1800 px
A4 document300 DPI2480×3508 px
Business card300 DPI1050×600 px
A3 poster150 DPI2480×3508 px
Billboard15–25 DPIVaries by size

Check Image DPI – Know If Your Image Is Print-Ready

DPI (Dots Per Inch) is the measurement of how many pixels are packed into one inch of a printed image. The higher the DPI, the sharper the print. Professional print services and publishers require a minimum of 300 DPI for high-quality printing, and rejecting images below this threshold is standard in publishing, commercial print, and photo lab workflows.

However, DPI metadata stored in a JPEG or PNG file is not the same as actual print quality. A 72 DPI image that is 6000×4000px will print beautifully at large format — the DPI metadata tag in the file is just a hint, not a hard constraint. What actually determines print quality is the total pixel count divided by the desired print size in inches. This tool calculates both the stored DPI metadata and the effective printable size at 72, 150, 200, and 300 DPI — so you can immediately see whether your image is suitable for your intended print size.

  • Print at 300 DPI — Required for photo labs, magazines, books, and professional print
  • Print at 150 DPI — Acceptable for large-format banners and posters viewed from distance
  • Screen at 72–96 DPI — Web and screen use only; looks sharp on monitors but prints softly

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